Material of foundation bolts

The material for foundation bolts is generally Q235 steel.

It mainly depends on what kind of equipment’s foundation bolts they are. Moving or stationary equipment? Q235A is usually sufficient.

The steel currently in use can basically be referred to as Q235; you’re right, that’s an appropriate way to describe it.

There are also those made of low-alloy steel 16Mn

Selection of Foot Bolt Materials and Processing Techniques 　　1. Selection of Foot Bolt Materials 　　Generally, Q235 is the preferred material for foot bolts; if the required strength is not sufficient, 16Mn can be used after conducting relevant calculations. Q235 is usually chosen, as these bolts are subject to tensile forces as well as pull-out forces. 　　In reality, anchor bolts play no significant role after the steel structure has been installed. Only partial shear force is present, as it is the various supports that play a key role after installation; therefore, when selecting foundation bolts, it is necessary to refer to the relevant standards first. In fact, we usually use Q235B or Q235A; Q345 is not generally used. The length of the bending hooks should be at least 150 MM. Foot bolts can be divided into equipment foot bolts and structural foot bolts. When selecting foot bolts, considerations should be given to the forces involved, namely the shear, tensile, and torsional forces exerted on them as fixing supports. Since the main force that foot bolts have to withstand is shear force, in most cases Q235 is sufficient (taking into account the ambient temperature as well to avoid \"blue brittle\" phenomenon). When the structures, buildings, or equipment secured by the foundation bolts are under significant tensile or torsional forces on those bolts, the former require selection of a suitable diameter through calculation, or the use of 16Mn with higher tensile strength; for the latter case, it is recommended to increase the number of foundation bolts to address the issue, as materials are quite expensive these days. 　　Q235A is the best choice; Q235B is more expensive than Q235A. Since the foundation bolts do not need to be welded, grade A is sufficient. 2. Material and processing technology for foot bolts: The processing of foot bolts involves first threading them, and then bending hooks on them; a Q235 rod of the same material and 150 MM in length is used horizontally near the hook. It should be noted that A3 is an old designation, and its equivalent today is Q235A. A3 was the name used in the past; although it is still used today, it is only employed in informal speech – it is best to avoid using it in written documents. It belongs to category A steel, and manufacturers of such steel only guarantee its mechanical properties rather than its chemical composition; as a result, impurities such as S and P may be present in higher amounts. Its carbon content is around 0.2%, which is roughly equivalent to that of grade 20 steel, and it corresponds to Q235 under the new standards. A3 and A3F are old designations; the current terms are Q235-A and Q235-A.F

These days, Q235B is generally used; Q235A is no longer used

The size of the bolts is determined based on the strength of the material, and they should be provided in accordance with the design requirements